[CI] Check test if the GenerationTesterMixin inheritance is correct 🐛 🔫 (#36180)

tests/models/big_bird/test_modeling_big_bird.py

@@ -451,6 +451,8 @@ class BigBirdModelTest(ModelTesterMixin, PipelineTesterMixin, unittest.TestCase)
         if is_torch_available()
         else ()
     )
+    # Doesn't run generation tests. There are interface mismatches when using `generate` -- TODO @gante
+    all_generative_model_classes = ()
     pipeline_model_mapping = (
         {
             "feature-extraction": BigBirdModel,